قوة الاختبار الإحصائي و حجم الأثر و حجم العينة للدراسات المنشورة في مجلة أبحاث اليرموك سلسلة العلوم الإنسانية و الاجتماعية

Abstract EN

This study tried to evaluate the test power, effect size and sample size of the research published in 16 volumes of Abhath Al-Yarmouk-Hummanities and Social Sciences Series.

The sampleconsisted of 785 statistical test, where 3 conventional tests, were used, namely the F test for ANOVA, the t test for means of independent samples and the t test for the correlation coefficient.

From data reported by the studies, Cohen d as a measure of effect size was calculated for each tested hypothesis and the power for the used statistical test was obtained from tables prepared by Cohen.

The study concluded that the major factor behind the high percentage (72.5 %) of rejected hypotheses and the high percentage (52 %) of statistical tests reaching Cohen criterion for minimal power (0.8) might have been the large sample size and not the effect size since hypotheses associated with a large effect size were only 26.5 %.